Abstract: To provide a method for producing a multicomponent copolymer with which a multicomponent copolymer having excellent rupture strength can be obtained, and a multicomponent copolymer, a rubber composition and a tire having excellent rupture strength. The method is a method for producing a multicomponent copolymer having a conjugated diene unit, a non-conjugated olefin unit and an aromatic vinyl unit, comprising adding a conjugated diene compound in divided portions into a reactor containing a catalyst and at least one selected from the group consisting of a non-conjugated olefin compound and an aromatic vinyl compound. The multicomponent copolymer is obtained with the production method. The rubber composition comprises the multicomponent copolymer as a rubber component. The tire uses the rubber composition.

Abstract: An object of the present disclosure is to provide a copolymer excellent in fracture resistance, ozone resistance and wear resistance. In order to achieve the object, the present disclosure provides a copolymer containing at least an ethylene unit, a C4-10 non-conjugated olefin unit and a conjugated diene unit, wherein a content of 3,4 or 1,2-vinyl bond in the conjugated diene unit is equal to or larger than 30 mol %.

Abstract: To provide a method for producing a multicomponent copolymer with which a multicomponent copolymer having excellent rupture strength can be obtained, and a multicomponent copolymer, a rubber composition and a tire having excellent rupture strength. The method is a method for producing a multicomponent copolymer having a conjugated diene unit, a non-conjugated olefin unit and an aromatic vinyl unit, comprising adding continuously or intermittently continuously a conjugated diene compound into a reactor containing a catalyst and at least one selected from the group consisting of a non-conjugated olefin compound and an aromatic vinyl compound. The multicomponent copolymer is obtained with the production method. The rubber composition comprises the multicomponent copolymer as a rubber component. The tire uses the rubber composition.

Abstract: An object of the present invention is to provide a multicomponent copolymer for use for producing a rubber composition and a rubber product such as tires and the like excellent in crack resistance and further having low heat generation while maintaining high weather resistance. Further, the present invention is to provide a rubber composition containing the multicomponent copolymer, a crosslinked rubber composition obtained by crosslinking the rubber composition, and a rubber product and a tire using the rubber composition or the crosslinked rubber composition. The multicomponent copolymer of the present invention contains a conjugated diene unit, a non-conjugated olefin unit and an aromatic vinyl unit, wherein the main chain is formed of an acyclic structure alone and the content of the aromatic vinyl unit is 5 mol % or less of the whole multicomponent copolymer.

Abstract: An object of the present disclosure is to provide a copolymer excellent in fracture resistance, ozone resistance and wear resistance. In order to achieve the object, the present disclosure provides a copolymer containing at least an ethylene unit, a C4-10 non-conjugated olefin unit and a conjugated diene unit, wherein a content of 3,4 or 1,2-vinyl bond in the conjugated diene unit is equal to or larger than 30 mol %.

Abstract: To provide a method for producing a multicomponent copolymer with which a multicomponent copolymer having excellent rupture strength can be obtained, and a multicomponent copolymer, a rubber composition and a tire having excellent rupture strength. The method is a method for producing a multicomponent copolymer having a conjugated diene unit, a non-conjugated olefin unit and an aromatic vinyl unit, comprising adding continuously or intermittently continuously a conjugated diene compound into a reactor containing a catalyst and at least one selected from the group consisting of a non-conjugated olefin compound and an aromatic vinyl compound. The multicomponent copolymer is obtained with the production method. The rubber composition comprises the multicomponent copolymer as a rubber component. The tire uses the rubber composition.

Abstract: To provide a method for producing a multicomponent copolymer with which a multicomponent copolymer having excellent rupture strength can be obtained, and a multicomponent copolymer, a rubber composition and a tire having excellent rupture strength. The method is a method for producing a multicomponent copolymer having a conjugated diene unit, a non-conjugated olefin unit and an aromatic vinyl unit, comprising adding a conjugated diene compound in divided portions into a reactor containing a catalyst and at least one selected from the group consisting of a non-conjugated olefin compound and an aromatic vinyl compound. The multicomponent copolymer is obtained with the production method. The rubber composition comprises the multicomponent copolymer as a rubber component. The tire uses the rubber composition.

Abstract: Provided is a polymerization catalyst composition capable of producing a conjugated diene polymer having a high cis-1,4 bond content or a conjugated diene-based copolymer having a high 1,4 bond content. The polymerization catalyst composition comprises: a Component (A) being a rare earth element compound represented by the following general formula (a-1): M-(AQ1)(AQ2)(AQ3), where M is selected from scandium, yttrium or lanthanoid elements; AQ1, AQ2 and AQ3 are the same or different functional groups; A is nitrogen, oxygen or sulfur; and the Component (A) has at least one M-A bond; a Component (B) being an ionic compound; and a Component (C) being a compound containing a cyclopentadiene skeleton selected from substituted or unsubstituted cyclopentadienes, substituted or unsubstituted indenes, or substituted or unsubstituted fluorenes.

Abstract: An object of the present invention is to provide a multicomponent copolymer for use for producing a rubber composition and a rubber product such as tires and the like excellent in crack resistance and further having low heat generation while maintaining high weather resistance. Further, the present invention is to provide a rubber composition containing the multicomponent copolymer, a crosslinked rubber composition obtained by crosslinking the rubber composition, and a rubber product and a tire using the rubber composition or the crosslinked rubber composition. The multicomponent copolymer of the present invention contains a conjugated diene unit, a non-conjugated olefin unit and an aromatic vinyl unit, wherein the main chain is formed of an acyclic structure alone and the content of the aromatic vinyl unit is 5 mol % or less of the whole multicomponent copolymer.

Abstract: Provided is a rubber composition having superior gas-barrier properties. More specifically, the rubber composition contains a layered compound and a modified butyl-based rubber having a functional group that interacts with the layered compound.

Abstract: Provided is a rubber composition having superior gas-barrier properties. More specifically, the rubber composition contains a layered compound and a modified conjugated diene-based polymer having a functional group that interacts with the layered compound.

Abstract: Provided is a rubber composition having superior gas-barrier properties. More specifically, the rubber composition contains a layered compound and a modified butyl-based rubber having a functional group that interacts with the layered compound.